Oldex syrup is an expectorant that is used to treat cough. This syrupp can be taken with or even without food after consulting your doctor. Complete the full course of the medicine otherwise the symptoms can relapse. Most commonly encountered side effects are dizzines, hence do not drive or operate machinery. It can also cause bloating, indigestion, nausea, headache, diarrhoea, sweating. Always consult your doctor on the dosage of this medicine. Make your doctor aware about any issues in your lung, liver and kidney. Also inform the doctor about your pregnancy or plan for pregnancy.